Fan speed control



FIG. 1 is a perspective front view of a fan speed control, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof, the opposite side being a mirror image; and,

FIG. 4 is a top view thereof, the bottom view being the same.

The rear view is unornamented.

The broken line showing in the figure drawings is included for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a fan speed control, as shown and described. 